This is the new 2.4GHz XBee XB24-Z7PIT-004 module from Digi. It is a replacement for the chip antenna module which is now obsolete.

Series ZB improves on the power output and data protocol. These modules take the 802.15.4 stack (the basis for Zigbee) and wrap it into a simple to use serial command set. These modules allow a very reliable and simple communication between microcontrollers, computers, systems, really anything with a serial port! Point to point and multi-point networks are supported.

Please Note: Series 1, Series 2.5 and Series ZB Xbee modules have the same pin-out. However none of the series can communicate with each other. Despite this, XBee and XBee-PRO ZB Modules are compatible with other devices that use XBee "ZB" technology. These include ConnectPort X gateways, XBee and XBee-PRO Adapters, XBee Wall Routers, XBee Sensors, and other products when designated with the "ZB" product name. Devices that do not have the "ZB" product name, including Digi's line of DigiMesh and 802.15.4 XBee products, are not compatible with XBee and XBee-PRO ZB Modules.